Sentences with phrase «dissolved organic»

Following these findings, the researchers recommend shorter productivity measurements to help minimize the effect of respiratory and dissolved organic carbon loss and hopefully produce more precise estimates of the ocean's global carbon productivity over smaller increments of time.

However, streams carry carbon — mainly as dissolved organic carbon and carbon dioxide — away from those peatlands, eventually releasing the greenhouse gas back into the atmosphere.

Animals and bacteria in the twilight zone often consume and further decompose the sinking marine snow, converting the carbon into dissolved organic and inorganic forms that can find their way back to the surface and then the atmosphere.

As more carbon dioxide dissolves into the water column, phytoplankton are able to increase their rate of photosynthesis, resulting in the production of more dissolved organic matter and the release of various nutrients.

If by dissolved carbon you mean dissolved organic matter, this is particulate organic matter where the particles are so small that they don't sink.

Higher water temperatures and changes in extremes, including floods and droughts, are projected to affect water quality and exacerbate many forms of water pollution — from sediments, nutrients, dissolved organic carbon, pathogens, pesticides and salt, as well as thermal pollution, with possible negative impacts on ecosystems, human health, and water system reliability and operating costs (high confidence).

Sulfate reduction rates increased fivefold during phases of active plant growth, probably fueled by dissolved organic matter released from the plant roots.

The researchers — who measured for the first time the radiocarbon content of aquatic carbon dioxide and dissolved organic carbon in headwaters of the western Canadian Arctic — believe that carbon originating from before 1750 comprises up to 37 % of total fluxes.

As the thawed layer deepened over the summer, the researchers found, the age of dissolved organic carbon rose by 120 - 125 %, while the age of carbon dioxide rose by 59 - 63 %.

Additional variables also being measured by Aqua include radiative energy fluxes, aerosols, vegetation cover on the land, phytoplankton and dissolved organic matter in the oceans, and air, land, and water temperatures.

Greater amounts of DOC (dissolved organic carbon) released in peatlands at higher CO2 levels are exported to streams and finally reach coastal waters (Freeman et al., 2004).

O'Donnell JA, Aiken GR, Walvoord MA, Raymond PA, Butler KD, Dornblaser MM, Heckman K (2014) Using dissolved organic matter age and composition to detect permafrost thaw in boreal watersheds of interior Alaska.

Aiken GR, Spencer RGM, Striegl RG, Schuster PF, Raymond PA (2014) Influences of glacier melt and permafrost thaw on the age of dissolved organic carbon in the Yukon River basin.

Separate sub-samples were collected for (1) refractive index, (2) alkalinity, (3) dissolved inorganic carbon and carbon isotopes, (4) pH, (5) gases (including CH4, CO2, and H2), (6) anions and silica, (7) nutrients, (8) dissolved organic carbon, (9) O and H isotopes, and (10) bacteria, in that order.

O'Donnell JA, Aiken GR, Swanson DK, Panda S, Butler KD, Baltensperger AP (2016b) Dissolved organic matter composition of Arctic rivers: linking permafrost and parent material to riverine carbon.

The interim results are the first time that a GHG emissions profile has been broken down into its «constituent elements of forest carbon stock change, non-CO2 emissions from biomass burning, CO2 and non-CO2 emissions from mineral soil, as well as biological oxidation and direct N2 O, dissolved organic carbon and CH4 emissions from disturbed peat, and CO2 and non-CO2 emissions from peat fire.»

Cao X, Aiken GR, Spencer RGM, Butler K, Mao J, Schmidt - Rohr K (2016) Novel insights from NMR spectroscopy into seasonal changes in the composition of dissolved organic matter exported to the Bering Sea by the Yukon River.

Tanski G, Couture N, Lantuit H, Eulenburg A, Fritz M (2016) Eroding permafrost coasts release low amounts of dissolved organic carbon (DOC) from ground ice into the nearshore zone of the Arctic Ocean.

Abbott BW, Larouche JR, Jones JB, Bowden WB, Balser AW (2014) Elevated dissolved organic carbon biodegradability from thawing and collapsing permafrost.

Eran Hood, professor of environmental science at the University of Alaska Southeast in Juneau, and colleagues report in Nature Geoscience that they developed a database of dissolved organic carbon found in 300 samples collected from glaciers on five continents.

The researchers estimate that the dissolved organic carbon released by melting glaciers will be an increase of half as much again on the current flow − the equivalent of about half the annual flow of dissolved carbon down the mighty Amazon River.

So they could begin to make an estimate of the rate at which dissolved organic carbon is re-entering the planetary system, and perhaps augmenting the carbon cycle.

The impact of glacier runoff on the biodegradability and biochemical composition of terrigenous dissolved organic matter in near - shore marine ecosystems

Molecular characterization of dissolved organic matter associated with the Greenland ice sheet

While 50 % of the sequestered carbon formed during photosynthesis is respired before sinking into the dark depths, a tremendous pool of dissolved organic carbon has been created that may not be respired for decades, centuries or millennia and slowly contributes to the pool of DIC at various depths and locations (Giorgiou 2002).

Bhatia, M. P., S. B. Das, K. Longnecker, M. A. Charette, and E. B. Kujawinski, 2010: Molecular characterization of dissolved organic matter associated with the Greenland ice sheet.

This suggests that the low oxygen and high dissolved organic carbon conditions that often develop in eutrophic systems promote elevated CH4 production relative to lower nutrient systems.

High rates of NPP may promote enhanced leaching of dissolved organic matter (DOM), fueling additional decomposition of terrestrial organic matter within tropical reservoirs.

These characteristics included morphometric, geographic, and historical properties of study reservoirs (i.e., depth, residence time, volume, surface area, age, and latitude), biologically significant water column solute concentrations (i.e., NO3 — , total phosphorus, and dissolved organic carbon), and metrics of ecosystem primary productivity (i.e., trophic status and mean or modeled surface water chlorophyll a concentrations; see the supplemental materials for a complete list of the tested variables).

Changes in precipitation and runoff in New England may be driving more dissolved organic carbon into the Gulf of Maine.

The flow of dissolved organic carbon (DOC) from land to sea typically accounts for a small fraction of an ecosystem's carbon budget compared with processes like photosynthesis and respiration.

Zhang et al. [2017] conducted lab experiments of leaching and found dissolved organic carbon (DOC) export of nearly five per cent of the carbon stored in surface soils.

Within this ice is dissolved organic carbon.

The potential impacts of changes in marine ecosystems or dissolved organic matter on climate are discussed in Section 7.3.4, and the impact of climate on marine ecosystems in Chapter 4 of the Working Group II contribution to the IPCC Fourth Assessment Report.

Because the carbon that stimulates methane production is primarily dissolved organic carbon carried downward through the peat by rainwater rather than the solid - phase carbon that forms peat, this change in transport depth doubled the peak production zones for methane.

(Then from conclusion):» Finally, the increased exudation of dissolved organic carbon might increase aggregation and potential for sinking of particles.»

Methane production is accelerated even more in areas dominated by sedges, grasslike plants that exude more easily altered forms of dissolved organic carbon from their roots.

But apparently not; in a new study by the Texas Water Development Board (TWDB), investigators found that water from green roofs had high levels of dissolved organic carbon.

That's the only place where the researchers can assess the contribution of microbes to generating dissolved organic matter without plants complicating the measurements.

[Response: If the rise in atmospheric CO2 at the end of the last glacial time had come from organic carbon (trees, peat, dissolved organic matter in the ocean) or especially methane (which is even more isotopically «light» than CO2) it would have left an isotopic signature.

The scientists, with National Science Foundation backing, are studying dissolved organic matter in water within glaciers and in ice - covered water bodies.

They should be fed daily with dissolved organic food and / or bacteria.

My research students and I are particularly interested in understanding the energetic cost of development, role of dissolved organic materials as a nutritional source for developing invertebrates, and variation in maternal contribution to offspring among groups.

The Science Sunlight and microbes found in Arctic waters interact to degrade dissolved organic carbon (DOC) that is flushed from thawing Arctic permafrost soils into...

March 20, 2018 Researchers analyzed dissolved organic carbon from water column samples collected in five regions to establish baseline data about its relative persistence and cycling in the northern Gulf of Mexico.

Microbes eat methane in the water and dissolved organic material brought in by the freshwater from the surface.

«Finding that methane and other forms of mostly invisible dissolved organic matter are the foundation of the food web in these caves explains why cave - adapted animals are able to thrive in the water column in a habitat without visible evidence of food,» lead author David Brankovits, from Texas A&M University at Galveston, said in a statement.

Shifts in dissolved organic matter and microbial community composition are associated with enhanced removal of fecal pollutants in urban stormwater wetlands — Xiao Huang — Water Research

This induces the fungi, which normally feed on dissolved organic matter, to eat the nearby nematodes.

When phytoplankton use carbon dioxide to make new cells, a substantial portion of that cellular material is released into the sea as a buffet of edible molecules collectively called «dissolved organic carbon.»